Quasifree (
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) Reactions on Oxygen Isotopes: Observation of Isospin Independence of the Reduced Single-Particle Strength

Atar, L.; Paschalis, S.; Barbieri, C.; Bertulani, C. A.; Fernández, P.; Holl, M.; Najafi, M. A.; Panin, V.; Álvarez‐Pol, H.; Aumann, T.; Avdeichikov, V.V.; Beceiro-Novo, S.; Bemmerer, D.; Benlliure, J.; Boillos, J. M.; Boretzky, K.; Borge, María José García; Caamaño, M.; Caesar, C.; Casarejos, E.; Catford, W. N.; Cederkäll, J.; Chartier, M.; Chulkov, L. V.; Cortina-Gil, D.; Cravo, E.; Crespo, R.; Dillmann, I.; Elekes, Z.; Enders, J.; Ershova, O.; Estradé, A.; Farinon, F.; Fraile, L. M.; Freer, M.; Redondo, Daniel Galaviz; Geißel, H.; Gernhäuser, R.; Golubev, P.; Göbel, K.; Hagdahl, J.; Heftrich, T.; Heil, M.; Heine, M.; Heinz, A.; Henriques, A.; Hufnagel, Alexander G.; Ignatov, A.; Johansson, H.; Jonson, B.; Kahlbow, J.; Kalantar‐Nayestanaki, N.; Kanungo, R.; Kelić-Heil, A.; Knyazev, A.; Kröll, T.; Kurz, N.; Labiche, M.; Langer, C.; Bleis, T. Le; Lemmon, R. C.; Lindberg, Simon; Machado, J.; Marganiec-Gałązka, J.; Movsesyan, A.; Nácher, E.; Nikolskii, E. Yu.; Nilsson, T.; Nociforo, C.; Perea, Á.; Petri, M.; Piétri, S.; Plag, R.; Reifarth, R.; Ribeiro, G.; Rigollet, C.; Rossi, D.; Röder, M.; Savran, D.; Scheit, H.; Simon, H.; Sorlin, O.; Syndikus, I.; Taylor, J. T.; Tengblad, O.; Thies, R.; Togano, Y.; Vandebrouck, M.; Velho, P.; Волков, В. А.; Wagner, A.; Wamers, F.; Weick, H.; Wheldon, C.; Wilson, G. L.; Winfield, J. S.; Woods, P. J.; Yakorev, D.; Zhukov, M. V.; Zilges, A.; Zuber, Κ.

doi:10.1103/physrevlett.120.052501

Cited by 84 publications

(67 citation statements)

References 46 publications

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“…Significant progresses have been made in understanding the source and features of the nucleon momentum distributions in finite nuclei especially from electron-nucleus scattering experiments during the last two decades [75,146,147,148,149,150,151,152,153,154,155], albeit there are still controversies especially from those experiments using nuclear probes, see, e.g., refs. [156,157,158,159,160]. Theoretically, large uncertainties exist in quantifying the shape, size and isospin dependence of the HMT of single-nucleon momentum distributions in neutron-rich matter, for a recent review, see, e.g., ref.…”

Section: The Role Of the Isospin-dependent Short-range Correlation (Smentioning

confidence: 99%

Towards understanding astrophysical effects of nuclear symmetry energy

et al. 2019

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Determining the Equation of State (EOS) of dense neutron-rich nuclear matter is a shared goal of both nuclear physics and astrophysics. Except possible phase transitions, the density dependence of nuclear symmetry Esym(ρ) is the most uncertain part of the EOS of neutron-rich nucleonic matter especially at supra-saturation densities. Much progresses have been made in recent years in predicting the symmetry energy and understanding why it is still very uncertain using various microscopic nuclear many-body theories and phenomenological models. Simultaneously, significant progresses have also been made in probing the symmetry energy in both terrestrial nuclear laboratories and astrophysical observatories. In light of the GW170817 event as well as ongoing or planned nuclear experiments and astrophysical observations probing the EOS of dense neutron-rich matter, we review recent progresses and identify new challenges to the best knowledge we have on several selected topics critical for understanding astrophysical effects of the nuclear symmetry energy.PACS. 2 6.60.Kp Contents B.A Li, P.G. Krastev, D.H. Wen and N.B. Zhang: Astrophysical Effects of Nuclear Symmetry Energy 5.2.2 Predicted correlation strength between the radii of neutron stars and the symmetry energy from low to high densities 32 5.2.3 Predicted effects of the symmetry energy on the tidal deformability of neutron stars 33 5.3 Post-GW170817 analyses of tidal deformability and radii of neutron stars as well as constraints on the nuclear EOS and symmetry energy . . . 34 5.3.

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Section: The Role Of the Isospin-dependent Short-range Correlation (Smentioning

confidence: 99%

Towards understanding astrophysical effects of nuclear symmetry energy

et al. 2019

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“…[11] or the single-nucleon removal experiments recently reported in Refs. [12,13]. At this time no clear consensus has been reached on this intriguing difference.…”

Section: Introductionmentioning

confidence: 99%

“…While the main reduction of strength can be attributed to long-range correlations (LRC) which are manifest in the reaction cross section at lower energy, it has been well documented that additional short-range and tensor correlations (SRC) are responsible for a 10-15% depletion of the IPM value [14]. These SRCs give rise to high-momentum nucleon pairs which have been measured with inclusive (e, e ) inelastic scattering by the Continuous Electron Beam Accelerator Facility (CEBAF) Large Acceptance Spectrometer (CLAS) collaboration at Jefferson Lab in 3 He, 4 He, 12 C, and 56 Fe [15]. Asymmetric nuclear-matter calculations for various realistic interactions have documented the importance of the tensor force in generating a larger depletion of the proton Fermi sea compared to the neutron one when protons are in the minority, thus generating relatively more high-momentum protons than neutrons [16,17].…”

Section: Introductionmentioning

confidence: 99%

Investigating the link between proton reaction cross sections and the quenching of proton spectroscopic factors in 48Ca

Atkinson

Dickhoff

2019

Physics Letters B

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The nucleon self-energies of 40 Ca and 48 Ca are determined using a nonlocal dispersive optical model (DOM). By enforcing the dispersion relation connecting the real and imaginary part of the self-energy, scattering and structure data are used to constrain these self-energies. The ability to calculate both bound and scattering states simultaneously puts these selfenergies in a unique position to consistently describe exclusive knockout reactions such as (e, e p). The present analysis reveals the importance of high-energy proton reaction cross-section data in constraining spectroscopic factors required for the description of the (e, e p) cross sections. In particular, it is imperative that high-energy proton reaction cross-section data are measured for 48 Ca in the near future so that the quenching of the spectroscopic factors in the 48 Ca(e, e p) 47 K reaction can be unambiguously constrained using the DOM. Measurements of proton reaction cross sections in inverse kinematics employing rare isotope beams with large neutron excess will provide corresponding constraints on proton spectroscopic factors for exotic nuclei. Moreover, DOM generated spectral functions indicate that the quenching of spectroscopic factors compared to 40 Ca is not only due to long-range correlation, but also partly due to the increase in high-momentum protons in 48 Ca on account of the strong neutron-proton interaction. Single-particle momentum distributions of protons and neutrons in 48 Ca calculated from these spectral functions confirm that neutron excess causes a higher fraction of high-momentum protons than neutrons.

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“…Recently, there have been several works regarding the use of eikonal scattering waves in the DWIA framework for the (p, 2p) reactions [61][62][63]. It will be interesting to evaluate the efficiency of eikonal approximation in the current (p, pα) case, which is expected to be discussed in our future work.…”

Section: E the Triple Differential Cross Sectionsmentioning

confidence: 99%

Direct probing of the cluster structure in Be12 via the α -knockout reaction

et al. 2019

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Background: Recent theoretical and experimental researches using proton-induced α-knockout reactions provide direct manifestation of α-cluster formation in nuclei. In recent and future experiments, α-knockout data are available for neutron-rich beryllium isotopes. In 12 Be , rich phenomena are induced by the formation of α-clusters surrounded by neutrons, for instance, breaking of the neutron magic number N = 8.Purpose: Our objective is to provide direct probing of the α-cluster formation in the 12 Be target through associating the structure information obtained by a microscopic theory with the experimental observables of α-knockout reactions. Method:We formulate a new wave function of the Tohsaki-Horiuchi-Schuck-Röpke (THSR) type for the structure calculation of 12 Be nucleus and integrate it with the distorted wave impulse approximation framework for the α-knockout reaction calculation of 12 Be(p, pα) 8 He.Results: We reproduce the low-lying spectrum of the 12 Be nucleus using the THSR wave function and discuss the cluster structure of the ground state. Based on the microscopic wave function, the optical potentials and α-cluster wave function are determined and utilized in the calculation of 12 Be(p, pα) 8 He reaction at 250 MeV. The possibility of probing the clustering state of 12 Be through this reaction is demonstrated by analysis of the triple differential cross sections that are sensitively dependent on the α-cluster amplitude at the nuclear surface. Conclusions:This study provides a feasible approach to validate directly the theoretical predictions of clustering features in the 12 Be nucleus through the α-knockout reaction.

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Quasifree ( p , 2p ) Reactions on Oxygen Isotopes: Observation of Isospin Independence of the Reduced Single-Particle Strength

Cited by 84 publications

References 46 publications

Towards understanding astrophysical effects of nuclear symmetry energy

Towards understanding astrophysical effects of nuclear symmetry energy

Investigating the link between proton reaction cross sections and the quenching of proton spectroscopic factors in 48Ca

Direct probing of the cluster structure in Be12 via the α -knockout reaction

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